Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1065, Issue -, Pages 120-134Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2014.02.043
Keywords
Crystal structure; 3D framework; Hydrogen bonds; Organic acids; Bis-benzimidazoles
Categories
Funding
- Education Office Foundation of Zhejiang Province [Y201017 321]
- Zhejiang A & F University Science Foundation [2009FK63]
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Eight crystalline organic acid-base adducts derived from alkane bridged bis(N-benzimidazole) and organic acids (2,4,6-trinitrophenol, p-nitrobenzoic acid, m-nitrobenzoic acid, 3,5-dinitrobenzoic acid, 5-sulfosalicylic acid and oxalic acid) were prepared and characterized by X-ray diffraction analysis, IR, mp, and elemental analysis. Of the eight compounds five are organic salts (I, 4, 6, 7 and 8) and the other three (2, 3, and 5) are cocrystals. In all of the adducts except 1 and 8, the ratio of the acid and the base is 2:1. All eight supramolecular assemblies involve extensive intermolecular classical hydrogen bonds as well as other noncovalent interactions. The role of weak and strong noncovalent interactions in the crystal packing is ascertained. These weak interactions combined, all the complexes displayed 3D framework structure. The results presented herein indicate that the strength and directionality of the classical N+-H center dot center dot center dot O-, O-H center dot center dot center dot O, and O-H center dot center dot center dot N hydrogen bonds (ionic or neutral) and other nonbonding associations between acids and ditopic benzimidazoles are sufficient to bring about the formation of cocrystals or organic salts. (C) 2014 Elsevier B.V. All rights reserved.
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